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108 lines
3.6 KiB
Python
108 lines
3.6 KiB
Python
# Copyright (C) 2007 Red Hat, Inc.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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# USA
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import os
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# /proc/PID/maps consists of a number of lines like this:
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# 00400000-004b1000 r-xp 00000000 fd:00 5767206 /bin/bash
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# 006b1000-006bb000 rw-p 000b1000 fd:00 5767206 /bin/bash
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# 006bb000-006c0000 rw-p 006bb000 00:00 0
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# ...
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# The fields are: address, permissions, offset, device, inode, and
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# (for non-anonymous mappings) pathname.
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#
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# /proc/PID/smaps gives additional information for each mapping:
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# 00400000-004b1000 r-xp 00000000 fd:00 5767206 /bin/bash
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# Size: 708 kB
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# Rss: 476 kB
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# Shared_Clean: 468 kB
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# Shared_Dirty: 0 kB
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# Private_Clean: 8 kB
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# Private_Dirty: 0 kB
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# Referenced: 0 kb
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#
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# The "Referenced" line only appears in kernel 2.6.22 and later.
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def get_shared_mapping_names(pid):
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"""Returns a set of the files for which PID has a shared mapping"""
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mappings = set()
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infile = open("/proc/%s/maps" % pid, "r")
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for line in infile:
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# sharable mappings are non-anonymous and either read-only
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# (permissions "r-..") or writable but explicitly marked
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# shared ("rw.s")
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fields = line.split()
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if len(fields) < 6 or not fields[5].startswith('/'):
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continue
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if fields[1][0] != 'r' or (fields[1][1] == 'w' and fields[1][3] != 's'):
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continue
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mappings.add(fields[5])
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infile.close()
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return mappings
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_smaps_lines_per_entry = None
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def get_mappings(pid, ignored_shared_mappings):
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"""Returns a list of (name, private, shared) tuples describing the
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memory mappings of PID. Shared mappings named in
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ignored_shared_mappings are ignored
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"""
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global _smaps_lines_per_entry
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if _smaps_lines_per_entry is None:
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if os.path.isfile('/proc/%s/clear_refs' % os.getpid()):
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_smaps_lines_per_entry = 8
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else:
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_smaps_lines_per_entry = 7
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mappings = []
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smapfile = "/proc/%s/smaps" % pid
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infile = open(smapfile, "r")
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input = infile.read()
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infile.close()
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lines = input.splitlines()
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for line_idx in range(0, len(lines), _smaps_lines_per_entry):
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name_idx = lines[line_idx].find('/')
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if name_idx == -1:
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name = None
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else:
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name = lines[line_idx][name_idx:]
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private_clean = int(lines[line_idx + 5][14:-3])
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private_dirty = int(lines[line_idx + 6][14:-3])
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if name in ignored_shared_mappings:
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shared_clean = 0
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shared_dirty = 0
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else:
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shared_clean = int(lines[line_idx + 3][14:-3])
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shared_dirty = int(lines[line_idx + 4][14:-3])
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mapping = Mapping(name, private_clean + private_dirty,
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shared_clean + shared_dirty)
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mappings.append (mapping)
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return mappings
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class Mapping:
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def __init__ (self, name, private, shared):
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self.name = name
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self.private = private
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self.shared = shared
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